Scott 3757--10c American Clock Stamp With Plate Number P6666

Elsewhere on the web, somebody reported the P6666 stamp is overall tagged, whereas the previous printings are printed on prephosphored paper (i.e., solid tagged), and is therefore a candidate for a minor Scott catalog number. I don't believe that is the case. The earlier printings in my collection are overall tagged with a pattern of diagonally-oriented phosphor dots. On a few examples, the taggant array does not completely cover the die cuts. My P6666 stamp is also overall tagged, but with a relatively smooth application of taggant. I can detect no pattern of dots. My conclusion is all examples of Scott 3757 are overall tagged, and that the printer used a different method to apply the taggant to the P6666 stamps.

Regards, Robert

Trainwreck, place one of the stamps face down over the other one and the die cut will match. I believe it is called "reverse die cut".